DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ)The Right Downpipe Back Exhaust for Your LB7 or LBZ Duramax If you own a 20012007 GM 2500 or 3500 with the 6. 6L Duramax LB7, LLY, or LBZ engine, the factory exhaust is holding your truck back. The Dieselr LB7 LBZ Duramax Downpipe Back Exhaust replaces restrictive OEM piping with a full mandrel bent T409 stainless system built for better airflow, lower EGTs, and long haul reliability. This isnt a universal kit. Its built specifically for your Duramax.
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DIESELR Downpipe Back Exhaust - Single (2001-2007 GM 2500/3500 6.6L Duramax LB7/LLY/LBZ)